Help me with the_excerpt()

Good day, friends.

I got madness with a making my formation of a short content of my article.

The site is written on the EP using the plug-in from Adobe Muse.
My task is make gray text shorter up to 20-25 words.
ATM i got minimum 55 word.
But I got no idea how to make it.

1. First i try to add this short code to functions.php, but got no result
////////
add_filter(‘excerpt_length’, ‘my_excerpt_length’);
function my_excerpt_length($len) { return 75; }
////////
and this one…
////////
function excerpt_word_limit($length) {
return 100;
}
add_filter(‘excerpt_length’, ‘excerpt_word_limit’);
////////

2. I know about two easy way to make it, but its not i want
2.1 First – is adding adding a custom excerpt checkbox
2.2 Or inserting “Read More Tag” in text-controlling panel

3. After this two ways i try to Add Custom Excerpts with Advanced Excerpt plugin.
But as you can imagine got no result.

Please help me !
I hope God bless u =)

The page I need help with: [log in to see the link]